Synonyms for Two:

adj.

double (adjective)
dualistic, twinned, double-faced, dual, second, two-fold, duple, twin, two-sided, paired, bi-form, duplex, binary, duplicate, double-barreled, twice, double, dyadic, bifurcated, bilateral, two-faced.
having two of something (adjective)
dualistic, bilateral, dyadic.

n.

eight, five, eleven, fifty, eighteen, cardinal number, billion, eighty, fifteen, crore. group, same. artifact (noun)
deuce.
duality (noun)
couplet, team, duet, brace, yoke, twosome, couple, dyad, doublet, pair, span, match.
duplication (noun)
bifurcation, duo.
twin (noun)
bifid.
two (noun)
deuce, cardinal, 2, ii.
two of something (noun)
deuce, dyad, brace, doublet, bifurcation, twin, span, binary, duet, double, couple, dual, team, pair.

Other synonyms:

n.
both, deuce, doublet, dyad, pair.